For a school project we had to create a network, so I decided I'd create an ASOIAF network starting from Ned. Using A Wiki of Ice and Fire and Gephi, I created a network with characters as nodes and their relationships as edges. The relationships I used were spouses, siblings and parent-child.
I'm including the .gephi file as well as a .gml file if anyone would like to play with the data.
Edit: Added Walder Frey's bastard children